whenever my car is cold and I start it for a little while sounds like right behind the dash on the by the engine firewall, it sounds like water being poured. and the faster i drive faster the water sound is. i don't have any coolant leaks, changed my radiator recently(it was making the sound before and after the radiator change)new radiator upper hose, and new thermostat and water pump. what can be causing this water pouring sound?
Thanks in advance,
Jason